ML20101C845

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Responds to Request for Addl Info Re 4160-volt Switchgear Vault & Forwards Listed Documents & Drawings.W/O Encl
ML20101C845
Person / Time
Site: Oyster Creek
Issue date: 03/03/1980
From: Mancinelli J
GENERAL PUBLIC UTILITIES CORP.
To: Koltay P
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20101C806 List:
References
NUDOCS 8412210219
Download: ML20101C845 (2)


Text

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'- . . ATTACHMENT 1 J;rssy Centr:I Pcw2r & Light Company

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Macison Avenue a: Punct. Bout Road Momstown. New Jersey 07963

, (201)455-8200, March 3,1980 s 1 Mr. Peter Koltay )

Huclear Regulatory Commission 631 Park Ave.  ;

King of Prussia, PA 19406

Dear Mr. Koltay:

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SUBJECT:

4160 Volt Fire Protection Vault ,e -

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Please~ find the following-documents and dradin'gs that you requested concerning the 4160 volt switchgear vault: ,

1. System description for 4160 volt Switchgear Ro'om; 218-77-18.1, Rev. 1.
2. Safety evaluation for the Fire Protection System Augmentation 4160 volt switchgear vault, 218-77-18.2 Rev. O.
3. Design criteria 218-77-38, Rev. O.

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4. Installation Specification, 218-77-45, Rev. 2. .
5. Installation Specification, 218-77-61, Rev.1.
6. GPU drawings E-1-110-313-001, Rev.1; E-1-110-313-002, Rev.1, and E-1-110-313-003, Rev.1.

-7. Marine Fabricators drawings Job #26465

. 101 thru 110 Rev. 2.

8. Bowman Construction drawings, 28555, Sheets 1, 2, and 3 dated 12-20-79.

Please be advised that some of your concerns regarding the 4160 volt vault have been<previously addressed in the following letters:-

8 041221 0 DR .

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i Jefiey Ct".:rs' Power 6 L g-* C,ompany is a fJe noer o'14 General Puba: Uv.1.es Systern ,

. a. Ivan Finfrock to the Director, NRC, dated March 23,1978; .

t b. Ivan Finfrock to the Director, NRC, dated .

June 1,1979.

In addition, all fire protection modifications have been reviewed in detail and approved by JCP&L's Fire Protection Consultant, Professional Loss Control Inc.

With respect to the exterior walls of the vault, they have been designed to provide a three-hour fire barrier to protect the switchgear from the lube oil fire hazard. This has been accomplished by a coating of fire -

retardant material applied to the exterior surfaces of the vault walls and ceiling. Manufacturer's test data, based upon ASTM E-119 testing, indicates that a two inch coating on. Walls and decks is the required thickness needed to. provide a three-hour fire barrier..

Any fire originating inside the vault will be of short duration due to the low fire loading, the detection system, and the nanual CO2 . For this reason, the interior wall separating the redundant switchgear is a two-hour fire barr.ier by designet-In actuality, however.. -the' fire rating is probably much . greater..tt'Detai:1. A on GPUSC drawing E ,1_110-313-001 shows..the interior .

det <ing :or wallccovered on each side with-lath and:1-11'/.16""of Pyrocrete:102.~ .0

-In cordance with the.manu#acturer's- test ' data',xthis would be equivalent'.to .

a two-hour barrier on each side of the ~ interior wall. ~ , ,

Concerning the seismic adequacy of Pyrocrete, manufacturer's test data indicates excellent adhesion and minor indentation without cracking resulting from impact testing, as compared with poured in-place concrete.

If you have any further questions,.please contact me.

Very truly yours, f bu

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J. F. Mancinelli lab 6

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